[GreenKeys] Need wiring sheet of a WU M15TTY Base

[Steve Ripper]

Thanks Jeff for the information. I moved into my new house in April and I am
just now getting my machines back online and I have the exact same problem.
All of the outlets the in the room I am using for radios and Teletypes are
the ground fault type. None of my machines will work in these type of
outlets.

 

Cheers,

 

Steve Ripper

steve.ripper at gmail.com

248-787-0705

ttytape signature 20Nov2011

 

From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Jeffrey D Angus
Sent: Saturday, August 03, 2013 3:52 PM
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Need wiring sheet of a WU M15TTY Base

 

On 8/3/2013 1:21 PM, Norm wrote:

Has anybody ever had this experience with a ground fault outlet? 

Ground Fault Interrupters are triggered by a difference of current
between the hot and the neutral side of the line. Obviously they
should BOTH be the same.

Some equipment, especially older, put a bypass capacitor from 
both sides of the power line to ground. 

Such being the case, since neutral is close to the same potential 
as the ground itself, there will be considerably less current through
the capacitor on the neutral side than on the hot side. That's your
imbalance and that's what is tripping the GFI.

<http://en.wikipedia.org/wiki/Residual-current_device>

For a trip current of 5 mA, that only requires 24K ohms. At 60 Hz,
this is the same as roughly 0.1 uF.

For this reason, the newer line bypass capacitors are typically no
more than 0.015 uF. (roughly 750 uA. Which by the way is still 
enough to get your ateention is you come across it.)

Additionally, the capacitors need to be X and Y rated for safe use
across mains power or from Mains power to ground.

<http://www.newark.com/pdfs/techarticles/johansondielectrics/JDI_Training-Sa
fety_2008-01.pdf>

Jeff-1.0
wa6fwi



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